Synergistic Effect of Sr and Ca Combined Additions on the Microstructure of A390 Aluminum Alloy

被引：2
作者：
Zhang Jiahong [1 ]
Xing Shuming [1 ]
Han Qingyou [2 ]
Guo Qiang [3 ]
Wang Rufen [3 ]
机构：
[1] Beijing Jiaotong Univ, Beijing 100044, Peoples R China
[2] Purdue Univ, W Lafayette, IN 47907 USA
[3] Tianjin Lizhong Alloy Grp Co Ltd, Tianjin 300457, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2018年 / 47卷 / 11期
关键词：
Al-Si alloys; modification; grain refinement; microstructure; AL-SI ALLOY; MECHANICAL-PROPERTIES; SILICON ALLOYS; GROWTH;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of Sr and Ca combined additions (Sr+Ca=0.05wt/%) on the microstructure of A390 aluminum alloy were evaluated by investigating the variation of quantity, size and shape of primary silicon, eutectic silicon, primary alpha phase and intermetallic phase. The results show that the variation of microstructures results from the synergistic effect of Sr-Ca additions. The loss rate of Sr is reduced with a small amount of Ca; meanwhile, the coarsening effect of primary silicon phase arising from Sr addition is also suppressed. The Sr in A390 aluminum alloy mainly modifies eutectic silicon phase and refines theta phase. Furthermore, Ca principally modifies primary silicon phase and primary alpha phase. The optimal microstructure is obtained when combined addition of 0.05%Sr-Ca is applied and the atomic ratio of Sr and Ca is 5:1, in which primary silicon phase and eutectic silicon phase as well as primary a phase are all modified significantly compared with those of only 0.05% Sr addition.
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页码：3301 / 3308
页数：8
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